Calling device



May 8, 1923. 1,454,496 A. VISCHER, JR

CALLING DEVICE Filed Decv 21 1920 :/3 F /5 6 v in u f i I -2 /0 Afrea Mime/7J4 Patented May 8, 1923.

insane FEQEQ ALFRED vr'soHER, JR, or FLORAL PAR-K, NEW YORK, essIG-Non 'ro' WESTERN ELEG- TRIO COMPANY, INCORPORATED, on NEW YORK, N. '1 a CORPORATION on NEW YORK,

CALLING nnvrcn.

Application. filedbecember 21, 1920. Serial No. 432,189;

Toallxw-kom it may concern Be itknown that I, ALFRED VrsoHnR, Jr., a citizen. of the United States, residing at Floral-Park, in the county of Nassau, State 015 New York, have invented certain new and useful Improvements in Calling Devices, of which the'fol-lowing is a full, clear, concise, and exact description;

This invention relates. to a calling .device by which separate groups of impulses may be transmitted An vobjectof-this invention is to produce a cheap, efficient and compact calling device or impulse sender of the dial type, such as is used for example with automatic telephone systems, and which will transmit calling impulses inuniform, cadence and which cannot be, speeded up in, itsoperation by the manipulator.

This Object'is accomplished by providing pawls on the finger wheel and the impulse transmitting mechanism which engage on the forward movement of the finger wheel from its normal position. Means are provided so that when the finger wheel is returned to normal independent of the impulse transmitting mechanism, it is locked in that position and cannot be moved forward until the impulse transmitting mechanism returns to normal, then the finger wheel pawl on theforward movement engages with and slides along the other pawl, and is thus rotated and the finger wheel released. A spring is provided which cooperates with the wheel pawl and rotates the same when it is disengaged from the impulse transmitting mechanism pawl in any position other than normal, so that further on gagement between the pawls cannot occur until the pawl carrying members return to normal where a projection carried by the casing rotates'the wheel pawl into an engageable position relative to the other pawl.

This invention will be more clearly understood by reference to the following detailed specifications and accompanying drawings.

Fig. 1 is a cross section of the calling de vice.

Fig. 2 is a plan view of the device with parts broken away to show the members in their normal positions I Fig. 3 is a plan of the device after the forward movement.

A casing 1 has any well-known impulse transmitting mechanism, such for example as shown in Patent No. 1,096,841, May 19, 191 1 to WV. Kaisling, mounted therein on shaft 19. The impulse transmitting mech- Y ftD-lSIII' is operated by spring 2.0 and the speed ofrotation is control-led by a governor, not

shown. Carried by the impulse transmittingmechanism-is a disk '2 which has a projection 3 on itsperiphery and a spring 4' attachedl Pawl 5 which has a curved face 6, is pivoted to disk 2 at 7 and'held inposition against-a stud 8 by a spring 9. Finger wheel 10 which isarotatably mounted on shaft 19 of the impulse transmitting mechanism has a pawl 11 pivoted thereto at 13. i

The pawl 11 has a curved face 12. Spring 14 is fixed to plate 15 which is attached to the finger wheel 10. The casing member 1 carries a curved projection 16' and. a second projection 18' which serves as. a stop for the impulse transmitting mechanism and a locking block for the finger wheel 10 when in positions by the impulse transmitting mecha nism. If the return of the finger wheel is accelerated, pawl 11 is released from pawl 5 and is rotated by spring 14: so that it cannot engage with. pawl 5 again until returned to its normal position where it is locked by block 18 and cannot be released until the impulse transmitting mechanism also returns to its normal position. A projection 16 serves to rotate the pawl 11 to a position where on its-forward movement it engages with pawl 5.

The finger wheel 10 may therefore bereturned to normal in advance of the mechanism, in which case it is locked against readvancement until the mechanism has also returned to normal whereupon the finger wheel is released as described above. If

: without the mechanism being returned to normal the finger wheel 10 is advanced after it has been accelerated, there will be no engagement between pawls 5 and 11 and there fore no effect on the movement of the transmitting mechanism and it will be necessary to return finger wheel 10 to normal before further impulses can be sent.

What is claimed is:

1. In a calling device, an electrical impulse transmitting mechanism, a rotatable finger wheel for operating said impulse transmitting mechanism, means to connect said wheel to said impulse transmitting mechanism when the wheel is moved forward from its normal position, and means to disengage said wheel from said impulse mechanism upon the acceleration of said wheel during its return movement, said means preventing readvanceinent of said mechanism upon the forward movement of said wheel from any position other than normal,

2. A calling device comprising a casing, an impulse transmitting mechanism mounted in said casing, a rotatable finger wheel for operating said transmitting mechanism, a pawl carried by said finger wheel, a second pawl carried by said impulse transmitting mechanism and adapted for sliding engagement with the finger wheel pawl when said wheel is moved forward from its normal position, and a spring cooperating with said wheel pawl to rotate the same when disengaged from said impulse transmitting device pawl so as to prevent engagement betweening for holding said wheel pawl in a position so it will engage with said impulse transmitting mechanism pawl when said wheel is moved forward from its normal position,

' wheel is moved forward from its normal position, a curved membercarried by said casand a spring'carried by said wheel and! co operating with said wheel pawl. to rotate the same when disengaged from said impulse transmitting mechanismpawl so as to pre vent engagement between the pawls when said finger wheel is moved forward from any position other than normal.

in witness whereof, I hereunto subscribe my name this 17 day of December, A. D. 1920. 1

ALFRED VISOHER, JR. 

